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A305205 a(n) = [x^n] exp(-Sum_{k>=1} x^k/(k*(1 - x^k)^n)). 2

%I #5 May 27 2018 19:46:44

%S 1,-1,-2,-3,-4,30,274,1841,9358,32463,-41557,-2265846,-28939286,

%T -272101778,-2038274408,-10494221259,9056975574,1244820826687,

%U 22703501504125,299864024917632,3221417281127823,26849622543478562,110101743392268978,-1810492304600468063

%N a(n) = [x^n] exp(-Sum_{k>=1} x^k/(k*(1 - x^k)^n)).

%H N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>

%F a(n) = [x^n] Product_{k>=1} (1 - x^k)^binomial(n+k-2,n-1).

%t Table[SeriesCoefficient[Exp[-Sum[x^k/(k (1 - x^k)^n), {k, 1, n}]], {x, 0, n}], {n, 0, 23}]

%t Table[SeriesCoefficient[Product[(1 - x^k)^Binomial[n + k - 2, n - 1], {k, 1, n}], {x, 0, n}], {n, 0, 23}]

%Y Cf. A073592, A292386, A292387, A293554, A305206.

%K sign

%O 0,3

%A _Ilya Gutkovskiy_, May 27 2018

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)